Fig. 1.
The general route for the synthesis of compounds 7a–e. Reagents and conditions: a) Acetone, rt, overnight; b) NaNO2, acetic acid, rt, 5 h; c) Sn Powder, HBr 48%, −10 °C for 2 h then overnight at rt; d) Acetic acid, Ethanol, rt, 24 h.
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